US3209478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple century calendars
Assignee: Individual
•
Filing: 1963-02-04
•
Granted: 1965-10-05
•
Expires: 1983-02-04
Abstract
No abstract record available.
Inventors
- 👤 Arthur S Burkert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:55
CPC Classifications
G; G09; G09D; G09D3/00; G09D3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB106681A
Cited
US1368257A
Cited
US2575555A
Cited
US2684545A
Cited
US2777231A
Cited
US2814139A
Cited
US3103080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |